Portable shearing tool



Aug. 18, 1931.

R. SUDRE PORTABLE SHEARING TOOL 2 Sheets-Sheet 1 Filed Feb.

Aug. 18, 1931. R. SUDRE PORTABLE SHEARING TOOL Filed Feb. 14, 1930 2 Sheets-Sheet 2 stationary,

Patented Aug. 18, 1931 UNITED STATES PATENT OFFICE RENE SUDRE, OF PARIS, FRANCE, ASSIGNOR T0 SOOIETE DEXPLOITATION DES BREVETS PORTABLE SHEARING TOOL Application filed February 14, 1930, Serial No. 428,461, and in France April 11, 1929.

The present invention relates to a shearing tool for cutting cables and steel bars, which is chiefly characterized by the fact that one of the cutting blades or knives is mounted the other blade being slidably mounted and connected to the operating device.

According to another feature of the invention, said slidable blade is actuated by a cam (or eccentric) controlled by the operating lever through the medium of a suitable speed reducing gear.

In a preferred form of construction, the speed-reducing gear comprises two speed reducing units, viz: a lever acting upon a pawl engagin g a ratchet wheel operatively connected with said cam or eccentric) through the medium of a speed-reduction gearing.

In the accompanying drawings, which are given solely by way of example:

Fig. 1 is a side view of a shearing tool according to the invention.

Fig. 2 is a like view of the tool, with one of the side plates removed.

Fig. 3 is a corresponding rear view.

Fig. 4 is an end view of the tool.

In the form of construction herein represented, the shearing tool comprises two steel blades or knives 1 and 2. The upper blade 1 is rigidly secured between two side plates 33 which are connected together at the top part by a spacing piece 5' and at the bottom part by a handle 6, the lower blade 2 is slidably mounted between said plates and has a slot 7 engaged by a stationary guiding stud 8.

The operating mechanism comprises a hand lever 9, pivotally mounted on a pivot pin 10 carried by a lug 11, secured to side plate 3. Beyond pivot pin 10 and near the same, lever 9 carries a stud 12 upon which are pivotally mounted a pair of links 13-13, Lug 11 has a curved slot 14 allowing the motion of stud 12. To the lower ends of links 13-43 is pivoted at 16 a pawl 17, engaging a ratchet wheel 18, keyed to a shaft 19 mounted between the side plates 3, 3. A second pawl 20, controlled by a spring 21, holds the ratchet wheel against rotation in the opposite direction to the arrow 7.

On the outer face of side plate 3, shaft 19 has keyed thereon a pinion 22, cooperating with a larger pinion 23, keyed to a shaft 24, mounted in the side plates 33. Between the side plates, and on shaft 24 is keyed a cam 25, engaged by a friction shoe 27 (Fig. 2) mounted at the end of blade 2 and urged toward said cam by a reaction spring 26.

' On shaft 19 and between the side plates is loosely mounted a roller 28, against which the blade 2 bears laterally; a pin 29 prevents said blade 2 from escaping and from moving sidewise.

The operation is as follows:

When lever 9 is moved away from the handle 6, the links 13 are lowered; the pawl 17 slides upon its ratchet wheel 18,held by pawl 20. When lever 9 is moved back towards the handle 6, the links 13 are raised, and pawl 17 turns the ratchet wheel 18 by a certain number of teeth in the direction of arrow f Pinion 22 is thus rotated, together with pinion 23 and cam 25, which turns through a very small angle in the direction of arrow f (Fig. 2). The cam thus radually raises the cutting blade 2. Its direction of rotation is suchv that the said blade is urged towards roller 28, by which it is properly guided.

he shearing or cutting tool above described provides for a great amplification of the force or leverage, and, byway of example, a force of 110 lbs. exercised upon lever 9 will produce a pressure of 20 tons at the cutting blade 2. With such a tool, which has a comparatively light weight and can thus be handled by a. single person, it is possible to cut cables of 2 inches diameter or even more, and steel bars of 11 inches diameter and even more.

Obviously, the invention is not limited to the form of construction herein described and represented, which is given solely by way of example.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a portable shearing tool, a frame, a handle rigid therewith, a cutting blade rigidly secured to said frame, a reciprocable cutting blade guided on said frame, rotary eccentric means pivoted to said frame an RENE SUDRE. 

